package com.hmdp.service.impl;

import cn.hutool.core.util.BooleanUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.hmdp.dto.Result;
import com.hmdp.entity.Shop;
import com.hmdp.mapper.ShopMapper;
import com.hmdp.service.IShopService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.CacheClient;
import com.hmdp.utils.RedisData;
import com.hmdp.utils.SystemConstants;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.geo.Distance;
import org.springframework.data.geo.GeoResult;
import org.springframework.data.geo.GeoResults;
import org.springframework.data.redis.connection.RedisGeoCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.domain.geo.GeoReference;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 */
@Slf4j
@Service
public class ShopServiceImpl extends ServiceImpl<ShopMapper, Shop> implements IShopService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Resource
    private CacheClient cacheClient;



    @Override
    public Result queryById(Long id) {
        //缓存穿透
//        Shop shop = cacheClient.queryWithPassThrough(CACHE_SHOP_KEY, id, Shop.class, this::getById,
//                CACHE_SHOP_TTL, TimeUnit.MINUTES);

        //互斥锁解决缓存击穿
        Shop shop = cacheClient.queryWithMutex(CACHE_SHOP_KEY, LOCK_SHOP_KEY, id,
                Shop.class, this::getById, CACHE_SHOP_TTL,
                TimeUnit.SECONDS, LOCK_SHOP_TTL, TimeUnit.SECONDS,
                CACHE_NULL_TTL, TimeUnit.MINUTES);

        //逻辑过期解决缓存击穿
//        Shop shop = cacheClient.queryWithLogicalExpire(CACHE_SHOP_KEY, LOCK_SHOP_KEY,
//                id, Shop.class, this::getById, LOCK_SHOP_TTL, TimeUnit.SECONDS,
//                5L,TimeUnit.SECONDS);


        if (shop == null){
            return Result.fail("店铺不存在");
        }
        return Result.ok(shop);
    }

    @Override
    @Transactional
    public Result updateShop(Shop shop) {
        Long id = shop.getId();
        if (id == null){
            return Result.fail("店铺id不能为空");
        }
        log.info("开始修改");
        boolean b = updateById(shop);
        log.info(String.valueOf(b));


        stringRedisTemplate.delete(CACHE_SHOP_KEY + id);

        return Result.ok();
    }

    @Override
    public Result queryShopByType(Integer typeId, Integer current, Double x, Double y) {

        // 1.判断是否需要根据坐标查询
        if (x == null || y == null) {
            // 不需要坐标查询，按数据库查询
            Page<Shop> page = query()
                    .eq("type_id", typeId)
                    .page(new Page<>(current, SystemConstants.DEFAULT_PAGE_SIZE));
            // 返回数据
            return Result.ok(page.getRecords());
        }

        int form = (current - 1) * SystemConstants.DEFAULT_PAGE_SIZE;
        int end = current * SystemConstants.DEFAULT_PAGE_SIZE;
        String key = SHOP_GEO_KEY + typeId;
        GeoResults<RedisGeoCommands.GeoLocation<String>> geoResults = stringRedisTemplate.opsForGeo().search(
                key,
                GeoReference.fromCoordinate(x, y),
                new Distance(5000),
                RedisGeoCommands.GeoSearchCommandArgs.newGeoSearchArgs().includeDistance().limit(end)
        );
        if (geoResults == null ){
            return Result.ok(Collections.emptyList());
        }
        List<GeoResult<RedisGeoCommands.GeoLocation<String>>> results = geoResults.getContent();
        if (results.size() <= form){
            //没有下一页了
            return Result.ok(Collections.emptyList());
        }

        ArrayList<Long> ids = new ArrayList<>(results.size());
        HashMap<String, Distance> map = new HashMap<>(results.size());
        results.stream().skip(form).forEach(result ->{
            String shopIdStr = result.getContent().getName();
            ids.add(Long.valueOf(shopIdStr));

            Distance distance = result.getDistance();
            map.put(shopIdStr,distance);
        });

        String idStr = StrUtil.join(",", ids);

        List<Shop> shops = query().in("id", ids).last("ORDER BY FIELD(id," + idStr + ")").list();
        shops.forEach(shop -> {
            shop.setDistance(map.get(shop.getId().toString()).getValue());
        });
        return Result.ok(shops);

    }
}
